Definitions
1.nounA strap; more specifically a piece of leather or a substitute (notably canvas), or strip of wood covered with a suitable material, for honing a razor, in this sense also called razor strop.
2.nounA bad mood or temper (see stroppy.)
3.nounA piece of rope spliced into a circular wreath, and put round a block for hanging it.
4.verbTo strap.
5.verb(recorded since 1842; now most used) To hone (a razor) with a strop."One should strop the razor before each shave."